gs gs106 Classes and Modules - JavaScript Extentions - Quiz No.1
gs gs106 Javascript Quiz
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Question 1: What will be the output of the following JavaScript code?
const pi=3.14; var pi=4; console.log(pi);
This will flash an error
Prints 4
Prints 3.14
Ambiguity
Question 2: The let keyword cannot be used ___________
as a substitute of var
as a block statement to define new variables
to define variables that are scoped to a single expression
in a else if loop, as a substitute for var
Question 3: The main difference between the variables declared with var and with let is __________
var is confined to a particular function but let is not
let is confined to a particular function but var is not
var defines values based on conditions but let does not
let doesn’t let you change the value of the variable
Question 4: What will be the output of the following JavaScript code if oddsums(5); is executed after the following code snippet?
function oddsums(n) { let total = 0, result=[]; for(let x = 1; x <= n; x++) { let odd = 2*x-1; total += odd; result.push(total); } return result; }
Returns [1,4,9,16,25]
Returns [1,2,3,4,5]
Returns [3,6,9,12,15]
Returns [1,3,5,7,9]
Question 5: What would be the result or type of error if p is not defined in the following JavaScript code snippet?
console.log(p)
Zero
Null
Reference Error
Value not found Error
Question 6: What will be the output of the following JavaScript code?
let x=x+1; console.log(x);
0
Null
Reference error
NaN
Question 7: What will be the output of the following JavaScript code?
[x,y]=[y,x];
Throws exception
Swap the value of the two variables
Flashes an error
Creates a new reference object
Question 8: Which looping statement allows XML tags to appear in JavaScript programs and adds API for operating on XML data?
for loop
while loop
for/each loop
do while loop
Question 9: Which exception does the Iterators throw from their next() method when there are no more values to iterate, that work on finite collections?
Exit Iteration
Abort Iteration
Abort
Stop Iteration
Question 10: Which method of the iterable object returns an iterator object for the collection?
iterator()
_iterator_()
_iteration_()
_return_iterator_()
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